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# Human Weight Lifts Shower Output Into Cistern Input

Move water from the shower output into the toilet cistern input by levering human weight.
 (+10) [vote for, against]

Water from showering could well be used as the input for the toilet cistern. One problem is that bathrooms are not built that way, but future bathrooms could be. Another problem is that the shower and the toilet are on the same level, typically alongside each other, which implies that the output water of the shower, if stored, ends up lower than the cistern of the toilet, and requires lifting.

My idea is to use the weight of the person using the toilet to elevate an amount of water to top up the cistern, using leverage, and only the energy supplied by the person's presence.

The toilet is either stood at or sat on, and in each case, could transfer the weight of the person onto a train of leverage mechanisms to move water from the shower output reservoir to the cistern reservoir.

The shower reservoir will obviously need to overflow, as it can store more than a few cistern-fulls, and the weight of the person will certainly not fill a cistern in one sitting (or standing), so it may transpire that this is not a completely efficient solution, but a partial contribution.

 — Ian Tindale, Jun 04 2008

What about the dogs that drink toilet water? Will they enjoy distearyldimonium chloride?
 — mylodon, Jun 04 2008

i'm pretty sure I weigh enough to transfer a few measly gallons of water 3' up... though I'd suggest using one of those blocks that help kids climb up onto the "throne" that can also act as a foot rest.
 — FlyingToaster, Jun 04 2008

 Let's see here. Assuming you mean 3 US gallons, in order to lift it 3' in one go, the following combinations would be required:

 Person weighs 100kg (220lbs) --> toilet needs to drop 10cm (4") when sat on.

 Person weighs 75kg (165lbs) --> toilet needs to drop 14cm (5.4") when sat on.

Person weighs 50kg (110lbs) --> toilet needs to drop 21cm (8.2") when sat on.
 — Texticle, Jun 04 2008

 Reuse water creatively. [+]

 Query: Do heavier people make more urine and fecal matter? If so, then this would make even more sense.

Off to hit up the government for a USD\$20,000,000.00 grant to study fecal levels vs. body weight.
 — Klaatu, Jun 04 2008

 I like the creative re-use of water, but I do not think the zany balancing mechanisms to raise the water are worth it. Just use a common electric pump for that.

 You'll probably find that these balancing mechanisms cost a lot of energy to manufacture, a lot more than an electric pump which could be quite small. If you raised the reservoir to cistern height the pump would only have to match shower output.

Bun for saving water.
 — Bad Jim, Jun 07 2008

In a high rise apartment block each cistern could use the output of the shower above it.
 — neelandan, Jun 08 2008

 [+] Could you also save water by using the weight of an individual to pressurize the cistern?

This way a powerful flush using minimal water would be ensured. If turd size is proportional to body mass, then a big person doing a large pipe-plugger would get a water blast strong enough to shinkansen that 5-coiler around the vapour trap.
 — TIB, Jun 08 2008

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